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Unread 07-11-2011, 08:02 PM   #1
Freestyle713
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1994 ZJ 
 
Join Date: Aug 2010
Location: , CT
Posts: 2,380
climate control

ive been using my a/c more often since i got it recharged, and i noticed the direction of the air that comes out of the vents switches between the windshield defrost and whatever other setting it may be set on at the time. anybody ever have this problem?

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Unread 07-11-2011, 10:38 PM   #2
JS97ZJ
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1997 ZJ 
 
Join Date: Dec 2009
Location: Dingmans Ferry, PA
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Check all of your vacuum lines including the vacuum canister. When you accelerate, the throttle plate opens decreasing vacuum. The canister acts as a reserve for holding the blending doors and operating the cruise control system. Also check the brake booster. If that's defective you'll get a hissing noise when the pedal is depressed and the pedal might slowly fade when your stopped at a light. (the booster is probably not the fault)
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Unread 07-11-2011, 10:58 PM   #3
KJK
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1998 ZJ 
 
Join Date: Jan 2007
Location: Dallas, Texas
Posts: 937
You have a faulty check valve in the vacuum line between the engine and the firewall.
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Unread 07-12-2011, 06:41 AM   #4
Freestyle713
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is this problem easy to fix? how do i go about checking the vaccum canister? and where would i find it?
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Unread 07-12-2011, 07:41 AM   #5
KJK
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Join Date: Jan 2007
Location: Dallas, Texas
Posts: 937
Check out this technical service bulletin.
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Unread 07-12-2011, 11:24 AM   #6
JS97ZJ
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Join Date: Dec 2009
Location: Dingmans Ferry, PA
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Quote:
Originally Posted by Freestyle713 View Post
is this problem easy to fix? how do i go about checking the vaccum canister? and where would i find it?
It's located under the battery tray.
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